Security researchers have observed an uptick in new Luca Stealer samples after the malware’s source code was made public.
Coded in Rust, the malware was initially observed in early July 2022, when its developer posted the source code on cybercrime forums, likely in an effort to boost their reputation.
The developer has since expanded the information stealer’s capabilities and also published the source code on GitHub. More than 25 Luca Stealer samples have been observed in the wild since the code was made public, security researchers at Cyble say.
Luca Stealer can extract information from numerous Chromium-based browsers, but also targets messaging applications, crypto wallets, and other applications. Furthermore, it has been updated with file-stealing capabilities.
According to Cyble, the stealer has been updated at least three times since the beginning of July, and its developer has shared information on how others can modify the malware and compile the source code.
The researchers also note that multiple threat actors might have already engaged in the development of the stealer.
The threat is designed to collect system information – such as desktop environment, device name, operating system distribution, hostname, username, language, network interface name, number of CPUs, memory details, and running processes – and store it in a text file.
It can also steal login credentials, credit card data, and cookies from over 30 Chromium-based browsers; data from 10 cold cryptocurrency wallets; data from the browser extensions of password managers and crypto wallets; and information from Steam, Telegram, and Uplay applications. Targeted messaging applications include Discord, ICQ, Element, and Skype.
Initially, Luca Stealer exfiltrated data using a Telegram bot, but the developer has since added support for Discord webhooks.
At the moment, Luca Stealer only targets Windows systems, but Cyble’s researchers believe that the malware developer may soon leverage Rust’s cross-platform capabilities to release variants targeting other platforms as well.
“As the stealer is written in Rust and is released for free, we can expect it to be adopted by multiple threat actors across the world,” Cyble concludes.